package com.dailywork.basepro.thread.concurrent.concurrent;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.locks.StampedLock;

/**
 * @author Benjamin Winterberg
 */
public class Lock6 {

    private static int count = 0;

    public static void main(String[] args) {
        ExecutorService executor = Executors.newFixedThreadPool(2);

        StampedLock lock = new StampedLock();

        executor.submit(
                () -> {
                    long stamp = lock.readLock();
                    try {
                        if (count == 0) {
                            stamp = lock.tryConvertToWriteLock(stamp);
                            if (stamp == 0L) {
                                System.out.println("Could not convert to write lock");
                                stamp = lock.writeLock();
                            }
                            count = 23;
                        }
                        System.out.println(count);
                    } finally {
                        lock.unlock(stamp);
                    }
                });

        ConcurrentUtils.stop(executor);
    }
}
